public static void main(String[] args) {

        String xmlStr = "<ybjcVo>"+

                    "<zbGrid>" +

                    "    <zbGridlbVO>" +

                    "        <ewblxh>1</ewblxh>" +

                    "        <lmc>本月数</lmc>" +

                    "        <yshwxse>按适用税率计算应税货物销售额</yshwxse>" +

                    "        <yslwxse>按适用税率计算应税劳务销售额</yslwxse>" +

                    "        <jxse>进项税额</jxse>" +

                    "    </zbGridlbVO>" +

                    "    <zbGridlbVO>" +

                    "        <ewblxh>3</ewblxh>" +

                    "        <lmc>本月数</lmc>" +

                    "        <yshwxse>按适用税率计算应税货物销售额</yshwxse>" +

                    "        <yslwxse>按适用税率计算应税劳务销售额</yslwxse>" +

                    "        <jxse>进项税额</jxse>" +

                    "    </zbGridlbVO>" +

                    "</zbGrid>"+

                "</ybjcVo>";

        try {

            Document document = DocumentHelper.parseText(xmlStr);

            Document documentCreate = DocumentHelper.createDocument();

            Element ybjcVoCreate = documentCreate.addElement("ybjcVo");

            Element zbGridCreate = ybjcVoCreate.addElement("zbGrid");

            Element ybjcVo = document.getRootElement();  

            Element zbGrid = ybjcVo.element("zbGrid");

            Iterator<Element>  zbGridlbVOList = zbGrid.elementIterator("zbGridlbVO");

             while(zbGridlbVOList.hasNext()){

                Element e = zbGridlbVOList.next();  

                String ewblxh = e.element("ewblxh").getText();

                String lmc = e.element("lmc").getText();

                String yshwxse = e.element("yshwxse").getText();

                String yslwxse = e.element("yslwxse").getText();

                String jxse = e.element("jxse").getText();

               Element zbGridlbVOCreate =  zbGridCreate.addElement("zbGridlbVO");

               zbGridlbVOCreate.addAttribute("ewblxh", ewblxh);

               zbGridlbVOCreate.addAttribute("lmc", lmc);

               zbGridlbVOCreate.addAttribute("yshwxse", yshwxse);

               zbGridlbVOCreate.addAttribute("yslwxse", yslwxse);

               zbGridlbVOCreate.addAttribute("jxse", jxse);

            }  

            String resultXml = documentCreate.asXML();

            System.out.println("resultXml:\n"+resultXml);

        } catch (DocumentException ex) {

            Logger.getLogger(T02.class.getName()).log(Level.SEVERE, null, ex);

        }

    }